| geographic variation in basal thermogenesis in little buntings: relationship to cellular thermogenesis and thyroid hormone concentrations. | acclimatization to different ambient conditions is an essential prerequisite for survival of small passerine birds. long-distance migration and winter acclimatization induce similar physiological and biochemical adjustments in passerines. to understand metabolic adaptations, the resting metabolic rate (rmr), the thermogenic properties of mitochondria in liver and muscle, and the activity of thyroid hormones were examined in field-captured little buntings (emberiza pusilla) between southeastern ( ... | 2013 | 23246502 |